This "revised" eye chart incorporates a slight change in the difficulty score for each of the ten SLOAN letters derived from the best corrected visual acuity examinations of 7,420 eyes during the ETDRS study.
The three ETDRS "2000" Series charts (Chart 1, 2, and 3) are balanced so that in each chart the ten SLOAN letters are represented at least once in every position.
For vision testing at 4 meters (13 ft.)
Acuity range 40M to 2M (20/200, 6/60 to 20/10, 63 equiv.)
Measures 62 X 65 cm (24.5 X 25.5 in.)
Fits ETDRS Illuminator Cabinet CAT. NO. 2425
Can also be wall-mounted
Similar to the "Original" Series ETDRS chart, this revised version features the use of three separate charts for the testing of each patient's eyes separately and together. Each of the three ETDRS charts feature a different configuration of optotypes while keeping an equal difficulty level from beginning to end. These differences in optotypes help prevent memorization and create a controlled and repeatable visual acuity test.
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